Slide-valve



(ModeL) R. DOTY.

SLIDE VALVE. No; 285.737. Patented Se'pt. 25, 1883.

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SLIDE-VALVE SPECIFICATION formingpart of Letters Patent No. 285,'737, dated September 25, 1883. Application filed July 6, 1883. (MoleL) To all whom it may concern:

Be it known that I, RILEY DOTY, of Leonardsburg, in the county of Delaware and State of Ohio, have invcnted certain new and useful Improvements in Slide-Valvesfor steam- Engines, of which the following is a full, clear, and exact description.

My improvements have reference to that class of engines em'ployin'g separate slidevalves for admission, and eXhaust of steam, wherebya better control of the steam, and consequent closer regulation, is Secured than can be obtained by the use of a single slide-valve.

The invention consists in a particular arrangement of the admissien slide-valve inits chest on a double-ported seat, in combination with an exhaust slide-valve arranged 'over a three or four ported seat in a separate chest, and having live steam admitted to balance the eXhaust-valve against the steam-pressure in the cylinder, the whole making an arrangement at once simple, practieal, and effective, all as hereinafter fully described and claimed.

Reference is to be had to the aeeompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures. p

Figure lis a longitudinal sectional elevation of a steam-cylinder with my improvemcnts applied. Figs. 2 and 3 are cross-see tions, respeetively, on the broken line a: x of Fig. 1, of the steam and eXhaust chests and their valves.

The letter a represents the steam or admission valve, which has a stem, I), to be connected to an eceentric, for moving the valve overits seat c for inlet of steam through ports d, alternately at either end of the cylinder e, said valve a being inclosed in any approved steam-tight chest f. a

The letter g represents the exhaust-valve, which works, by the reciprocation of its stem h, within aseparate chest,`ro`, here placed diametrically opposite the steam-valve a and its chest; but valve q may be placed in a chest on the side of the cylinder, at right angles to' valve a, if desired, the eXhaust-passages being arranged eorrespondingly. The exhaust- 'valve g has recesses j j, which alternately connect the steam-exhaust portskfrom the cylinder e with the adjacent exhaust-passages Z, which communicate with the common outlet,

m, (dotted in Fig. 1,) to which the eXhaustpipe of the engine has any suitable connection. The letter ;o represents asmall pipe, leading, preferably, from the steam-supp1y pipe below the-governor-valve, for supply of live steam to the chest z', to hold the valve g closcly to its seat against the outward pressure of the steam from the eylin der through the ports k and from passages Z m. The ends g' of Valve g overlap or cover the eXhaust-ports k at all points when the valve is elosing said ports, so that no waste of steam from pipe 0 takes place through the exhaust-passages, and provision may be made, by any suitable drip-eock or pipe-connection, to withdraw the water of condensation from chest i, as required.

In the operation of my improvements, and with the valves positioned as in Fig. 1, steam is being admitted through the left-hand port d to drive pisten 1) to the right, the cylinder c being meanwhile exhausted through the righthand passages k j l m, and the valves act in like manner at the opposite end of the cylinder on the return-stroke, as will readily be understood, the movements of the steam and exhaust valves a g being relatively timed with each other to relieve the pisten 1) of all back pressure, or as much of it as desired, for regulating the freedom of the exhaust from the cylinder, or the amount of cush-ion for the pisten for insuring the best economy in practice.

My improvement-s may be applicd to cylinders having the steam and eXhaust ports arranged in the center, ifdesired It will be noted that the arrangement of valves a g in separate steam and exhaust cham.- bers or 'chests permits the use of inlet o for seating the eXhaust-valve {1 without waste of steam, and also adapts the valves to be set as desired, and with the greatest precision, and also to be driven by separate eonnections for maintaining any constant relative adjustment of the valves a g with each other which shall give the best results.

I do not abandon or dedicate to the public any patentable features set forth herein and not hereinafter claimed, but reserve the right to` claim the same either in a reissue of any patent that may be granted upon this application or in other applications for Letters Pat cnt that I may make.

IOO

5 chest, f, the exhaust-valve g,wo1*kngn a sep- &rate chest, i, and having extensions g' of the ends, and the lve-stean nlet o, substantially as shown and described.

2. The combnatomwth the stemn-oylinder IO and its pisten, of the nlet-valve a,eontro11ng ports d to both ends of the cylnder, the eX- 'and the lve-steznn nlet o,

haust-valve g, having end extensions, g', and passages j, eontrolling eXha'ust-passages k Im, substantally as specified, said valves co g being arranged in separate chests f i, and for operation by independent conneetons, suhstantally as shown and described.

RLEY DOTY.

W'tnesses:

A. I. Mosns, JOHN D. LEEPER. 

